Hello,
I am trying to make 120 (4 rows and 30 columns) LED's go on and off alternatively. (At every given point in time 60 LED's are turned on and 60 off)
Components and Parameters : Function Generator : AFG 300; Switch Dg202b http://www.vishay.com/docs/70037/dg201b.pdf; Op amp-741Cn; transistor (Using 8 transistors) : MJH6284 http://http://www.onsemi.com/pub_link/Collateral/MJH6284-D.PDF; LED: BXRA-C0402 (Need a minimum of 7V to light up) http://www.leds.de/out/media/67920.pdf
I am using: A square pulse from a function generator (1Hz and 5V) A switch to control each row An op-amp to invert the square pulse (resulting in the alternating On and Off) The rows are connected in parallel (L1 to L3 to L5 to L7....L29 AND L2 to L4 To L6 To L8...L30). The columns are connected in series (L1 to L2 to L3 to L4) and are controlled by switches as shown in the image
The switches are placed in so that either a row(s) or column(s) can be turned on and off
I am supplying 5V at the base of the transistor through the switch (and op-amp depending on the light, L2 to L4 To L6 To L8...L30), +10 at the collector and -10 at the emitter.
The Problem: when I connect a single transistor to my circuit, the square pulse is 5V, as i increase the number of transistors the voltage given by the function generator reduces, which in turn reduces the luminescence of my LED's (some don't even light up).
I am using a 10 amp AC-DC powersupply
I am not at liberty to change the components and the LED's are pre-wired, how do I get the maximum luminescence for all the LED's (at 9V and 15 Amp for the rows, and accordingly for the columns)
Where am I going wrong?? (NEED HELP ASAP)
thanks!
I am trying to make 120 (4 rows and 30 columns) LED's go on and off alternatively. (At every given point in time 60 LED's are turned on and 60 off)
Components and Parameters : Function Generator : AFG 300; Switch Dg202b http://www.vishay.com/docs/70037/dg201b.pdf; Op amp-741Cn; transistor (Using 8 transistors) : MJH6284 http://http://www.onsemi.com/pub_link/Collateral/MJH6284-D.PDF; LED: BXRA-C0402 (Need a minimum of 7V to light up) http://www.leds.de/out/media/67920.pdf
I am using: A square pulse from a function generator (1Hz and 5V) A switch to control each row An op-amp to invert the square pulse (resulting in the alternating On and Off) The rows are connected in parallel (L1 to L3 to L5 to L7....L29 AND L2 to L4 To L6 To L8...L30). The columns are connected in series (L1 to L2 to L3 to L4) and are controlled by switches as shown in the image
The switches are placed in so that either a row(s) or column(s) can be turned on and off
I am supplying 5V at the base of the transistor through the switch (and op-amp depending on the light, L2 to L4 To L6 To L8...L30), +10 at the collector and -10 at the emitter.
The Problem: when I connect a single transistor to my circuit, the square pulse is 5V, as i increase the number of transistors the voltage given by the function generator reduces, which in turn reduces the luminescence of my LED's (some don't even light up).
I am using a 10 amp AC-DC powersupply
I am not at liberty to change the components and the LED's are pre-wired, how do I get the maximum luminescence for all the LED's (at 9V and 15 Amp for the rows, and accordingly for the columns)
Where am I going wrong?? (NEED HELP ASAP)
thanks!
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